Google is marking Earth Day 2013 on Monday with what might be its busiest yet more subtle animated doodles. In fact, its level of involvement has led Google to provide a checklist to make sure you don’t miss anything, CNET reports. Highlighting the Earth’s complexity on the 43rd Earth Day, the doodle offers a snapshot of the four seasons our fragile planet experiences, as well as some of its flora and fauna. “Today we are celebrating Earth Day with an interactive doodle that captures a slice of nature’s subtle wonders,” Doodler Leon Hong wrote. “We hope you enjoy discovering animals, controlling the weather, and observing the seasons. Use the sightseeing checklist below to make sure you do not miss anything!”